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a58844379c
This provides internal features on _ASAsyncTransaction and ASDisplayNode to facilitate implementing public API that allows clients to choose if they would prefer to block on the completion of unfinished rendering, rather than allow a placeholder state to become visible. The internal features are: -[_ASAsyncTransaction waitUntilComplete] -[ASDisplayNode recursivelyEnsureDisplay] Also provided are two such implementations: -[ASCellNode setNeverShowPlaceholders:], which integrates with both Tables and Collections -[ASViewController setNeverShowPlaceholders:], which should work with Nav and Tab controllers. Lastly, on ASDisplayNode, a new property .shouldBypassEnsureDisplay allows individual node types to exempt themselves from blocking the main thread on their display. By implementing the feature at the ASCellNode level rather than ASTableView & ASCollectionView, developers can retain fine-grained control on display characteristics. For example, certain cell types may be appropriate to display to the user with placeholders, whereas others may not. Follow-up work will include unit tests, revisiting names, and the header locations of definitions.
65 lines
1.3 KiB
Objective-C
65 lines
1.3 KiB
Objective-C
//
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// ASViewController.m
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// AsyncDisplayKit
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//
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// Created by Huy Nguyen on 16/09/15.
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// Copyright (c) 2015 Facebook. All rights reserved.
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//
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#import "ASViewController.h"
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#import "ASAssert.h"
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#import "ASDimension.h"
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// FIXME: Temporary nonsense import until method names are finalized and exposed
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#import "ASDisplayNode+Subclasses.h"
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@implementation ASViewController
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{
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BOOL _ensureDisplayed;
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}
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- (instancetype)initWithNode:(ASDisplayNode *)node
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{
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if (!(self = [super init])) {
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return nil;
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}
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ASDisplayNodeAssertNotNil(node, @"Node must not be nil");
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ASDisplayNodeAssertTrue(!node.layerBacked);
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_node = node;
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return self;
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}
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- (void)loadView
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{
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ASDisplayNodeAssertTrue(!_node.layerBacked);
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self.view = _node.view;
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}
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- (void)viewWillLayoutSubviews
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{
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[super viewWillLayoutSubviews];
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CGSize viewSize = self.view.bounds.size;
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ASSizeRange constrainedSize = ASSizeRangeMake(viewSize, viewSize);
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[_node measureWithSizeRange:constrainedSize];
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}
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- (void)viewDidLayoutSubviews
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{
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if (_ensureDisplayed && self.neverShowPlaceholders) {
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_ensureDisplayed = NO;
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[self.node recursivelyEnsureDisplay];
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}
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[super viewDidLayoutSubviews];
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}
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- (void)viewWillAppear:(BOOL)animated
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{
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[super viewWillAppear:animated];
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_ensureDisplayed = YES;
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[_node recursivelyFetchData];
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}
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@end
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